Question

please help i give metals

Answer 1

I would say...
2. a, because theories are changeable, based on new information found.
3. b, covalent bonds are formed between 2 or more nonmetals
4. c, group 2, period 3; groups are columns and periods are horizontal.\
5. a, the atomic number of an element is the number of electrons; the atomic number of Mg
is 12, so the number of electrons is also 12.
6. a, cellular respiration releases energy, so it is exothermic.

hope this helps ;D